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I was looking at my sub that came as a part of a $40 surround kit from newegg and wondering exactly where the 60watt RMS sub speaker was. Since I didn't see it on the outside (bad design?) I decided to crack the biggest box open. Well there it was... all sealed up inside a two room box. The area behind the cone is completely sealed... and the area in front is a ported chamber. Shouldn't the speaker be on the outside with the back of it in a ported chamber? I took a few pictures so you can see what I'm talking about. I'm thinking of knocking out that middle wall to make it one large chamber and putting the speaker on the side. That's the way all the other subs I've seen are done. Is this a good idea and could it help get the most out of this weak sub (which at the moment makes next to no bass, just some wooshing noises), or should I just leave it as is? The only requirement is I have to use this box because all the volume and surround adjustments are on a front panel of the sub (bad design again).

And one separate question: why does the sub cone have four wires going to it? There's a red and black pair on each side.
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well you could always pop the speaker and cables out, create a box that better suits the sub, looks like a 5 or 10 inch...thats all i can think of.
 

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Your sub shouldn't be sealed. It needs a hole somewhere to let out air pressure otherwise bad things happen. yeah it should be on outside with back in chamber with a port of someform.

If you want a challenge build a chamber your self.
 

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Discussion Starter #4
Quote:

Originally Posted by metalkobra
well you could always pop the speaker and cables out, create a box that better suits the sub, looks like a 5 or 10 inch...thats all i can think of.
Well all the volume and surround adjustments are on a front panel of the sub (bad design again) so I have to stick with this box. Also it's a 5 inch... nothing compared to my 12 but I just want it for some higher bass.

Quote:

Originally Posted by Cuthy
Your sub shouldn't be sealed. It needs a hole somewhere to let out air pressure otherwise bad things happen. yeah it should be on outside with back in chamber with a port of someform.

If you want a challenge build a chamber your self.

Yeah that's what I was thinking. For the back of the cone there is nowhere for the air pressure to go so it's pretty handicapped I think.
 

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Discussion Starter #6
Quote:

Originally Posted by SpookedJunglist
Your sub enclosure is called Band pass. One side of the case is sealed. and the other is ported. It allows for more bass at lower frequencies but at a smaller frequeny range. It is perfectly normal sub box
Oh... so this is a normal design? Would I be better off leaving it as is then? I was noticing it sounds darn good at 45 Hz but much lower or higher and it starts to fade away.
 

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Yes it is completely normal. If you are not familiar with box design I suggest that you leave it alone. There are benifits to to different bass enclosures.
I will try to break them down for you with as few words as possible


Sealed boxes:
produce nice tight bass across a broad frequency range. These are the best sounding boxes in my oppinion.They have the flattest frequency response. They require slightly more power from the amp though.

Ported boxes:
Usually larger than a typical sealed box . they will be usually louder than a ported box. the frequenxy range is still good. but not very flat frequency response causing there to be very peaky notes. thos notes are usually adjusted via port length.

Isobaric:
Basically two speakers face to face but off phase. usually installed in a sealed box. requires two subs so ill skip the details.

Band pass:
Read above post.

Any questions?
 

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Discussion Starter #8
Quote:

Originally Posted by SpookedJunglist
Yes it is completely normal. If you are not familiar with box design I suggest that you leave it alone. There are benifits to to different bass enclosures.
I will try to break them down for you with as few words as possible


Sealed boxes:
produce nice tight bass across a broad frequency range. These are the best sounding boxes in my oppinion.They have the flattest frequency response. They require slightly more power from the amp though.

Ported boxes:
Usually larger than a typical sealed box . they will be usually louder than a ported box. the frequenxy range is still good. but not very flat frequency response causing there to be very peaky notes. thos notes are usually adjusted via port length.

Isobaric:
Basically two speakers face to face but off phase. usually installed in a sealed box. requires two subs so ill skip the details.

Band pass:
Read above post.

Any questions?
yes... how is a ported box usually louder than a ported box?
 

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it was a typo, they are louder than a sealed box... your box is a bandpass type box,the loudest of all desighns, but also, the most distortion producing, i have the same type sub as you with my theater system and i was thinking the same as you, but i instead left the box the way it was, excepy put the port of your sub directly onto a much larger box, that itself had a port in it, i lost some spl, but i gained exponential amounts of low end frequency response! which is what i like... so it comes down to what music/sound your playing through the sub and what u prefer as to what kind of box u need...
 

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bandpass are realy only used in car audio where the tunning freqency (most likely around 45hz in this case) is used to complement the gain in the car. usually 120?.

in a large room that doesn't apply so bandpass is rarely used because it offers such a small frequency response.

what i would do is keep the front cover off and lift the sub onto the desk. behind the monitor (if possible) and see if thats what you like.

you'll probably get worst low booming bass but that'll be made up in tight controled and probably more accurate bass in a larger frequency range.

its really up to personal opinion though. see what you like.
 

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Discussion Starter #11
Quote:

Originally Posted by pbasil1
it was a typo, they are louder than a sealed box... your box is a bandpass type box,the loudest of all desighns, but also, the most distortion producing, i have the same type sub as you with my theater system and i was thinking the same as you, but i instead left the box the way it was, excepy put the port of your sub directly onto a much larger box, that itself had a port in it, i lost some spl, but i gained exponential amounts of low end frequency response! which is what i like... so it comes down to what music/sound your playing through the sub and what u prefer as to what kind of box u need...
Well it sounds about impossible to make a sub for me then... I lisiten to everything from rap with some nice low bass to metal with some long bass guitar notes. I also like techno/rave too but not so much anymore as there doesn't seem to be any new stuff coming out.
 

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here ar the pix of the design, the system i have is a cambridge soundworks DTT2500...
the larger box was an old speaker box that i took the drivers out of and used, i put a port in it using a pvc pipe about 2"wide and 6-7" long

 

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you should probably build a ported box,that will handle your blend of music, i listen to just rap, which u know has mad low end, so i like to shake the floors.... my box design there hits about 20hz... which is insane for a little 4.5",20 watt sub
many people dont realize this but 90% of speaker performance is the design of the box. people tend to go buy a 500$ sub and put it in a cheap box, then i come around with a 100$ sub and out perform them... and they wonder how it happened.
 

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Discussion Starter #14
Quote:


Originally Posted by pbasil1

you should probably build a ported box,that will handle your blend of music, i listen to just rap, which u know has mad low end, so i like to shake the floors.... my box design there hits about 20hz... which is insane for a little 4.5",20 watt sub
many people dont realize this but 90% of speaker performance is the design of the box. people tend to go buy a 500$ sub and put it in a cheap box, then i come around with a 100$ sub and out perform them... and they wonder how it happened.

Darn I just put it all back together...
Oh well, I've still got my SAWM40... 12 inch 120watt in a GIGANTIC ported box. Does a large ported go well with a small bandpass or should they both be ported? I mostly like low stuff too... the high bass really annoys me.

 

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Remember these tips...


*The worst place for a subwoofer is in the middle of a room.

*As you move the subwoofer closer to a wall, the bass output will become stronger, Or try to put it under a bed or something like that.

*Bass output will be maximized as you push the subwoofer into a corner.

*The closer you sit to a wall, the more pressure your ear will pick up and the greater the bass intensity will be, but it may become uneven-- alternately boomy or anemic as you move in either direction.

*Adjusting the distance of the couch or chairs relative to the walls and/or the subwoofer relative to the corner will almost always be beneficial in helping smooth out the deep bass heard at several listening locations in the room.

*If buy a Speaker system make sure the subwoofer is bigger than 6.5".
 

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well u need to figure out how big your smaller sub box is and how big your 12" box is...im thinking the 12" box might be to large.... i used an old 8" bookshelf speaker box

 

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Discussion Starter #17
Quote:


Originally Posted by dpg

Remember these tips...


*The worst place for a subwoofer is in the middle of a room.

*As you move the subwoofer closer to a wall, the bass output will become stronger, Or try to put it under a bed or something like that.

*Bass output will be maximized as you push the subwoofer into a corner.

*The closer you sit to a wall, the more pressure your ear will pick up and the greater the bass intensity will be, but it may become uneven-- alternately boomy or anemic as you move in either direction.

*Adjusting the distance of the couch or chairs relative to the walls and/or the subwoofer relative to the corner will almost always be beneficial in helping smooth out the deep bass heard at several listening locations in the room.

*If buy a Speaker system make sure the subwoofer is bigger than 6.5".

Thanks, I'm pretty sure I've got placement covered
They are both against a wall, at an angle with it, right in front of a big sealed desk. If I move it anywhere else it sounds like crap.

Quote:


Originally Posted by pbasil1

well u need to figure out how big your smaller sub box is and how big your 12" box is...im thinking the 12" box might be to large.... i used an old 8" bookshelf speaker box

Too big? I didn't build it... it was bought that way. I don't really think I wanna go changing it either. One question though: what's with all the foam in your box? Wouldn't that dampen the noise?
 

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Quote:


Originally Posted by Fishie36

Thanks, I'm pretty sure I've got placement covered
They are both against a wall, at an angle with it, right in front of a big sealed desk. If I move it anywhere else it sounds like crap.

u may also want to try the adjacent coner to you, the opposite one u sit at... or even the closet or small pantry of some type in you room(if its on the other side of the room) that will actually amplify the pressure waves in a way!
 

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Quote:


Originally Posted by Fishie36

Thanks, I'm pretty sure I've got placement covered
They are both against a wall, at an angle with it, right in front of a big sealed desk. If I move it anywhere else it sounds like crap.

Too big? I didn't build it... it was bought that way. I don't really think I wanna go changing it either. One question though: what's with all the foam in your box? Wouldn't that dampen the noise?

the foam is a cheap way to skip using sound absorbing material inside the box, because wood kindof "reflects bass" u can get a slight echo sound from subwoofers and speakers from the sound bouncing around off the walls inside the box, so u use a sound deadening materal to obsorb the sound an stop it from echoing... dynomat works best, but some good old high density foam works well too
 

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Discussion Starter #20
Quote:


Originally Posted by pbasil1

u may also want to try the adjacent coner to you, the opposite one u sit at... or even the closet or small pantry of some type in you room(if its on the other side of the room) that will actually amplify the pressure waves in a way!

Well... now i'm curious to find a better place for this thing
I don't have the proper length cables to try a different spot right away but here's some overall pictures of the room in it's current state (ignore the awful mess).

EDIT: And do you think it's possible my SAWM40 could need sound dampening? I've never opened it before but the sound doesn't sound at all echoey.

 
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